minor #17108 [Routing] Skip PhpGeneratorDumperTest::testDumpWithTooManyRoutes on HHVM (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
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[Routing] Skip PhpGeneratorDumperTest::testDumpWithTooManyRoutes on HHVM

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

phpunit reports:
- before: `Memory: 430.91Mb`
- after: `Memory: 21.26Mb`

Commits
-------

cb23212 [Routing] Skip PhpGeneratorDumperTest::testDumpWithTooManyRoutes on HHVM

src/Symfony/Component/Routing/Tests/Generator/Dumper/PhpGeneratorDumperTest.php

@@ -85,6 +85,10 @@ class PhpGeneratorDumperTest extends \PHPUnit_Framework_TestCase
 
     public function testDumpWithTooManyRoutes()
     {
+        if (defined('HHVM_VERSION_ID')) {
+            $this->markTestSkipped('HHVM consumes too much memory on this test.');
+        }
+
         $this->routeCollection->add('Test', new Route('/testing/{foo}'));
         for ($i = 0; $i < 32769; ++$i) {
             $this->routeCollection->add('route_'.$i, new Route('/route_'.$i));